Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ee6599e1cfd758…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 10:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2dc01ea51e1c8ab4bf610bc479842903 SHA-1: a175140403c3ff1da6b7647c03d2324d9156b080 SHA-256: 76ee6599e1cfd758255a062c6732ac9b2b2685254d8e028ea0b626d7574f2685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple embedded URLs, many pointing to potentially malicious or compromised sites, supports the classification as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archielectronics.com/userfiles/files/kemixig.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/mibod.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/63225673085.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4ba541a7a3736c81d86432c396ddfdb6/61320977163.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608551e82ee48---63867603048.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202192135368177.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/650493fad3c5349944561b7ec2342a3a/31794932055.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/aa32271863c4c36381897c1d0ad0abdc/73589461374.pdfIn PDF document text
    • http://rurisnet.org/images/file/2004914496.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf86a89017---rugevajifujawap.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/xiwuvosotusuv.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mniqnrk5o7g25fbu3gcgupim9v/43652415710.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/95524042750.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/mupakomalamifiwew.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f383397e1c17de7c1a75ff86790febca/nivik.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/madebukujani.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/996pb331bk6gk32crffutmahj3/vinugidug.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/fezozu.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/17937304715.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c77db8a9c---vojizoz.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/jikapezixuful.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/vimaribiposowav.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/94617708958.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01b223f80b---3509305127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+men%27s+hairstylistPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b10ea275feef9af3a7373af4d093bbbf/76408660200.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 15196 bytes
SHA-256: 9801a8bbd36912246585fbdf01724a50f8a258129c3f7fdd6ae59b46542efff1
font_02_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10364 bytes
SHA-256: 73539ff1c0f3a65e2dbc3a38accad56318cc924573a09702d6028ca55b6d3d52

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